/*
 * Copyright 2004-2005 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.grails.plugins.codecs

import java.security.MessageDigest

abstract class DigestUtils {

    // Digest byte[], any list/array or string into a byte[]
    static digest(String algorithm, data) {
        if (data == null) {
            return null
        }

        def md = MessageDigest.getInstance(algorithm)
        def src
        if (data instanceof Byte[] || data instanceof byte[]) {
            src = data
        }
        else if (data instanceof List || data.getClass().isArray()) {
            src = new byte[data.size()]
            data.eachWithIndex { v, i -> src[i] = v }
        }
        else {
            src = data.toString().getBytes("UTF-8")
        }
        md.update(src) // This probably needs to use the thread's Locale encoding
        return md.digest()
    }
}
